Please educate me on wheelsets. I have read that the best upgrade a person can do to a bike is to upgrade the wheelset. OK, but with what?

Does anyone have a link to an article that explains what to look for in wheels and what a customer might expect as they go up in price for wheels? And what difference they might experience with better wheels? There are a lot of advertisements but no simple chart. Does one exist? I am hoping to find something like the chart that shows the various levels of Shimano components. Also, a lot is produced about road bike wheels, but are there any singnificant differences in hybrid wheels?

Thanks for any help. Searched for previous posts on this topic. If I missed something, I apologize.